THE COMMON 310 S QUITO 



75 



In my observations on this species I was interested to 

 notice that on the first day the adults which emerged 

 from the pupae were invariably males ; on the second day 



Fig. 13.— Adult female of Culex pungens; enlarged. (Original.) 



the g-reat majority were males, but there were also a few 

 females ; the preponderance of males continued to hold for 

 three days ; later the females were in the majority. 



The duration of a generation as indicated above, is, as 

 we have seen, a minimum duration. If a spell of cold 

 weather should come in the middle of the summer, the 



